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agentic-dev/apps/cms/AGENTS.md

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# apps/cms -- Payload CMS Admin Shell
## Purpose
**THIN SHELL ONLY** -- this app exists solely to serve the Payload CMS admin panel via Next.js. All CMS logic (collections, globals, hooks, access control, `payload.config.ts`) lives in `@repo/cms-core`. This app contains no custom CMS code beyond Next.js routing boilerplate that Payload generates automatically.
## Port: 3001
```bash
pnpm dev --filter @repo/cms # http://localhost:3001/admin
```
Requires PostgreSQL running first:
```bash
docker compose up -d postgres # Starts PostgreSQL on port 5432
```
## Hard Rules
- **NEVER** add collections, globals, hooks, or access control in this app -- put them in `@repo/cms-core`
- **NEVER** import from `@repo/core/infrastructure`
- **NEVER** modify auto-generated files (marked with "THIS FILE WAS GENERATED AUTOMATICALLY BY PAYLOAD")
- All CMS configuration changes go in `packages/cms-core/`
## Key Files
| File | Purpose |
|---|---|
| `next.config.mjs` | Next.js config wrapped with `withPayload()` from `@payloadcms/next` |
| `tsconfig.json` | TypeScript config with `@payload-config` path alias |
| `src/app/(payload)/layout.tsx` | Auto-generated Payload root layout (DO NOT MODIFY) |
| `src/app/(payload)/admin/[[...segments]]/page.tsx` | Auto-generated catch-all admin page (DO NOT MODIFY) |
| `src/app/(payload)/admin/[[...segments]]/not-found.tsx` | Auto-generated 404 page (DO NOT MODIFY) |
| `src/app/(payload)/importMap.js` | Auto-generated Payload import map (DO NOT MODIFY) |
| `src/app/(payload)/custom.scss` | Custom SCSS overrides for admin panel styling |
## @payload-config Alias
The `tsconfig.json` defines a path alias that points to the config in `@repo/cms-core`:
```json
{
"compilerOptions": {
"paths": {
"@payload-config": [
"../../packages/cms-core/src/payload.config.ts"
]
}
}
}
```
When Payload or auto-generated files import `@payload-config`, it resolves to `packages/cms-core/src/payload.config.ts`. This is how the thin shell delegates all configuration to `@repo/cms-core`.
## next.config.mjs
The Next.js config is minimal -- just the `withPayload` wrapper:
```javascript
import { withPayload } from "@payloadcms/next/withPayload";
/** @type {import('next').NextConfig} */
const nextConfig = {};
export default withPayload(nextConfig);
```
`withPayload()` adds the necessary webpack aliases, module resolution, and middleware for Payload to work within Next.js.
## Auto-Generated Files
The files under `src/app/(payload)/` are generated by Payload and should NOT be manually edited:
- **`layout.tsx`** -- Wraps the admin panel with `RootLayout` from `@payloadcms/next/layouts`, injects config and importMap
- **`admin/[[...segments]]/page.tsx`** -- Catch-all route that renders `RootPage` from `@payloadcms/next/views`
- **`admin/[[...segments]]/not-found.tsx`** -- 404 handler using `NotFoundPage` from `@payloadcms/next/views`
- **`importMap.js`** -- Maps Payload component paths for the admin UI
If you need to regenerate these files, Payload will do so automatically during dev/build.
## Type Generation
To regenerate Payload TypeScript types after changing collections/globals:
```bash
cd apps/cms && pnpm generate:types
# Equivalent to: payload generate:types
# Output goes to: packages/cms-core/src/payload-types.ts
```
## Dependencies
| Dependency | Purpose |
|---|---|
| `@repo/cms-core` | All Payload configuration (collections, globals, hooks, config) |
| `@payloadcms/next` | Next.js integration for Payload (withPayload, admin UI views) |
| `@payloadcms/ui` | Payload admin panel React components |
| `payload` | Payload CMS core |
| `next` | Next.js 15 framework |
| `react` / `react-dom` | React 19 runtime |
| `sharp` | Image processing for Payload uploads |
## Cross-References
- **ALL CMS configuration:** `packages/cms-core/` -- see `packages/cms-core/AGENTS.md`
- **CMS client for querying data:** `packages/cms-client/` -- see `packages/cms-client/AGENTS.md`
- **Core business logic:** `packages/core/` -- see `packages/core/AGENTS.md`